If you think raising a family is expensive, you should try being the Duggar Family. Michelle Duggar, 41, is pregnant with the family's 18th child. Michelle and Jim Bob have 10 boys and 7 girls ranging from the ages of 20, down to 9 months old. There are two sets of twins in the mix, making this Michelle's 16th pregnancy.

The family lives in Arkansas in a 7,000 square foot home that they built themselves, and was showcased on cable show for Discovery. The household definitely runs based upon a huge group effort, as the older children are assigned to looking after the younger ones and everyone helps out with assigned chores that they call "jurisdictions."

The Discovery channel has done several features about the family, and even has a web page for them with a game called "Name That Duggar" and a trivia section. (Did you know that Michelle has been pregnant for 135 months?)

So if you think it's expensive to feed a few kids in your home, imagine what it must be like when the Duggar family goes grocery shopping. The Duggars say that they're going to accept all the blessings God wants to give them, meaning they might not stop having kids any time soon. I have no idea how they feed all those children. If you have any insights, let me know!

Tracy L. Coenen, CPA, MBA, CFE performs fraud examinations and financial investigations for her company Sequence Inc. Forensic Accounting, and is the author of Essentials of Corporate Fraud.